What HD software are you using? You're best off using the copy of Drive Setup that comes with OS 8.1 on a 6300.

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i try use drive setup thart comes with OS 8.1 an comes with OS 9.0.4 and nothing....

i think this hard drive(Quantum) is incompatible with Performa 6300CD...today i conected a seagate with 40GB 8-o running OS 9.0.4 and work'd fine :-/ ......

I go to give up this Hard drive quantum [!] !]'>

thanks guys!